(19)

(11)

EP 3 939 058 A2

(12)

(88) Date of publication A3: 28.11.2019 (43) Date of publication: 19.01.2022 Bulletin 2022/03 (21) Application number: 19733947.6 (22) Date of filing: 20.05.2019

(51) International Patent Classification (IPC):  H01F 7/02(2006.01) H01F 41/02(2006.01) (52) Cooperative Patent Classification (CPC): H01F 7/021; H01F 41/0266 (86) International application number: PCT/EP2019/062969 (87) International publication number: WO 2019/202172 (24.10.2019 Gazette 2019/43)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (30) Priority: 23.04.2019 CN 201910328341 (71) Applicant: Siemens Gamesa Renewable Energy A/S 7330 Brande (DK)	(72) Inventors: AZAR, Ziad Sheffield South Yorkshire S10 4ED (GB) URDA, Adriana Cristina 2300 København S (DK) THOUGAARD, Hans-Joergen 8600 Silkeborg (DK) Yl, Dong 014030 Baotou, Inner-Mongolia (CN) (74) Representative: Aspacher, Karl-Georg  Siemens Wind Power GmbH & Co. KG Postfach 22 16 34 80506 München 80506 München (DE)